Respiration losses in planktonic green algae cultivated in raceway ponds

Quantitative Assessment of Microalgae Biomass and Lipid Stability Post-Cultivation

“…Such is the case of the reduction of particulate matter in Chlorella pyrenoidosa incubations under anoxic axenic conditions observed by Foree and McCarty (1970). Also, green microalgae Coelastrum sphaericum and Scenedesmus falcatus incubated under dark conditions at various temperatures (16, 22, and 28°C) reported an overall biomass loss between 2 and 10% during the first 12 h of darkness (Grobbelaar and Soeder, 1985). In addition, it has been shown that respiration in Dunaliella salina exposed to 10-30°C produced total carbon losses in the order of 50-60% in 20 days (Degens et al, 1968).…”

“…After the respiration process consumes the available oxygen in an hermetically sealed containment (preventing gas exchange), an oxygen-limited environment will be formed (Mishra and Gamage, 2007). Under limited oxygen conditions, the rate of respiration is dramatically reduced (Grobbelaar and Soeder, 1985) and ultimately can lead to anaerobic environments. Anaerobic conditions are harsh as they lead to fermentation and decay (Mishra and Gamage, 2007).…”

The Enhancement of Photosynthesis by Fluctuating Light

“…I k is lower for low light-acclimated algae than for high light-acclimated algae. Even dark respiration (R d ) varies considerably depending on the light history (Grobbelaar & Soeder, 1985), where high lightacclimated algae will have higher dark respiration rates than low light-acclimated ones. However, the question of the effect of flashing light on the photoacclimation process has not been studied.…”

Algal Biosensor-Based Measurement System for Rapid Toxicity Detection

“…A possible explanation for this might be the relationship between toxicity and photoinhibition (Göksan et al, 2003), which is more likely to occur at low concentration due to the influence of mutual shading at high algal concentration (Contreras-Flores et al, 2003;Evers, 1991;Richmond, 2000). Though concentrations exceeding 0.182 g cell/L were not evaluated in the present study, it is supposed that mutual shading might be involved in high-density algal culture (Grobbelaar & Soeder, 1985). Taken together, 0.095 g cell/L was selected and employed for the subsequent experiments.…”